Note:
Fielding stats are a combination of official records and RetroSheet
records. Both are likely to have substantial errors and will not match perfectly.

View Complete Notes on Fielding Data

Leagues historically made no effort to balance team, league, and player fielding stats. Since 1990 or so, computers have made this feasible, but prior to that there are hundreds or thousands of discrepancies each year in games played (even whether a player played a position), putouts, assists, double plays and errors.

Pre-1945 SB & CS data for catchers is estimated from catcher assists, games started and opposition stolen bases.

From 1945 on SB, CS, Pickoff, & WP data for catchers and pitchers is taken from play-by-play accounts in the retrosheet files. There are several hundred games without pbp from 1945 to 1973 and for those we may not have any data.

CG & GS come from the retrosheet data and should be complete and pretty accurate from 1916 on.

Innings played (like SB and CS) come from the retrosheet play-by-play data and should be considered mostly complete from 1945 to 1973 and complete from then on.

Stats (PO,A,G, etc) for LF-CF-RF positions (since 1916) is taken from play-by-play or box score data as available.

Stats (PO,A,G,etc) for C,P,1B,2B,3B,SS,OF positions is taken from the official reported totals and may have been corrected at various times since their publication.

†
Statistics like WPA, REW and RE24 are computed from play-by-play data which is only complete from 1974 to the present. From 1945-1973, the data is incomplete, though for most seasons only less than 20 games per season total are missing. Please see our page on
data coverage
for a full view of the data used to create these leaderboards.